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2.2.7 Proposition To every Lie group G is associated a real Lie algebra g of the same dimension, consisting of the left-invariant vector fields on G and operation of Lie bracket

It follows from The- orem 2.4.5 that every real Lie algebra g can be realized as the Lie algebra of a subgroup of GL(n, R ). Further, owing to Theorem 2.6.2, we can find

Accordingly, in view of Corollary 1.2.3, a real irreducible representation of a topological group G is called of real type, complex type or quaternionic type whether End G (V )

(Sketch) The topological universal covering space G ˜ of G can be constructed as the quotient of the space P (G, 1) of continuous paths in G originating at the identity by

It meant that one could not expect to obtain interesting geometry and topology from the study of Riemannian Hilbert manifolds with the seemingly natural choice of structure group,